Improve handling around required flags

[ccremer]

Summary

• If a required flag was not given, it would show usage without displaying the error
• It turns out determining whether to print Metadata based on the arguments is nigh impossible. So let's leave that up to the subcommands

Checklist

• Categorize the PR by setting a good title and adding one of the labels:
  bug, enhancement, documentation, change, breaking, dependency
  as they show up in the changelog
• Update tests.